#include<stdio.h>
int main()
{
	double s1,s2;
	char op;
	scanf("%lf %c %lf",&s1,&op,&s2);
	switch(op)
	{
		case '+': printf("%.2f", s1 + s2); break;
		case '-': printf("%.2f", s1 - s2); break;
		case '*': printf("%.2f", s1 * s2); break;
		case '/':
			if(fabs(s2)>1e-10)
			printf("%.2f", s1 / s2);
			else
			printf("Wrong input!");
			break;
		default:
			printf("Wrong input!");break;
		
	}
	return 0;
	
	
	
}
